Hard foam polyether means that the product is hard and is the main material of hard foam polyether. The synthesis is mainly formed by the polymerization of sugar, sorbitol, low functionality alcohol and PO at a certain temperature and pressure. Polyurethane rigid foam combined polyether is one of the main raw materials of polyurethane rigid foam, also known as white material, and together with polymeric MDI, it is called black and white material. It is mainly used for building thermal insulation, cold preservation, solar energy, water heaters, cold storage, constant temperature storage, beer cans, cold storage and other occasions that need thermal insulation and cold preservation.